Well uh... I'm not sure if you should be asking me, as I'm no expert in authoring.
You are the best. i have been trying to author but takes me ages. Any tips?
Anyways, it depends on what exactly is taking you ages?
Tempo mapping? Part authoring? Vocals? etc
I'd suggest you read/watch the tutorials in the Authoring Support forums, it helped me a lot when I began authoring my stuff.